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This study was done to observe the effect of omental pedicle flap in neuroraphies , sciatic nerve of 8 dogs which divided into equal two groups .The neuroraphy was performed, after that greater omentum was prepared by median laporotomy which later pass through a tunnel formed in the inguinal region by preserving its vascular supply and adapted then wrapped around the zone of neuroraphy in treated group.asciatic nerves of control group were severed and primary neuroraphy was done without applying omental flap. The histological examination of the biopsy specimens was done in the 60 day for both groups. The amount of regenerated axons and intra neural connective tissue in two groups were examined. In the revasculorized neuroraphies by omental flap, there was a significant increase the number of regenerated nerve fibres and reduced perineural fibrosis when compared with control group. Introduction A great deal of experimental and clinical studies have been carried out in the restoration of complex function of peripheral nerve for many years.The first primary neuroraphy was reported by Ionly and Hashimotoin 1917 on the other hand, first attempt of neural grafting were mentioned by (1) .Sunderland has studied the nerve vascularisation in 1945 and has observed that he reported vascular supply to peripheral nerve was segmental. Furthermore, he reported the vascular passing through thin membrane on connective and thus he was the first to define the mesoneurium (2).The effect of omental wrapping on nerve graft regeneration and observed higher count of axons in the cases where the nerve graft was wrapped with omentum were mentioned by (1,2). Omentum play a central role in peritoneal defence by adhering to sites of inflammation and providing leukocytes for local immune response (3). The first attempt for using omentum in grafting was done by Jobert and Lambelle in 1826. While Ranvier 1980 had described omentum and defined its milk spots as a mesenchyma cells clusters –like which has high immuno active due to its content of macrophages , histocytes and mast cells that made omentum highly effected in wound healing and also on 1972 there was an attempt of transport of omental pedical flap from abdomen to the neck to treat avulsion wound in the head were mentioned by (4).While it was shown that higher blood vessels population as well as a good orientation of the regenerated nerve fibres homogenization of nervous tissue and proliferation of blood vessels when he wrapped infected sciatic nerve by omentum (5).Other researchers were observed that milk spots contain fenestrated blood vessels ,So omentum used to treat chronic lymph oedema depending on absorption mechanism by transport omental flap to the effected extremities (6 and 7). In the present study we wrapped omental pedicle flap on the sciatic nerve to investigate the effectiveness of the omentum on sciatic nerve regeneration. Materials and methods As experimental animals , 8 healthy dogs of local breed from different sexes and races weight between (10-15) Kg were used , and reared in separated cages ,then divided into two equal groups as control and treated respectively.The operations were made under sterilized surgical environment , mixture of ketamine 15 mg / kg and xylazine 5 mg / kg was injected after 10 minutes of atropine sulfate 0.03 mg / kg I / M injection to prepare the dogs for surgery. With vertical incision on the lateral femoral area of hind limbs ,the sciatic nerve was reached

Study the effect of the omental pedicle flap in sciatic nerve healing